Maybe once in a lifetime 也许一生只有一次
maybe a lifetime
也许一辈子
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It costs energy and time, maybe a lifetime.
它需要时间、精力，也许要一辈子的努力。
youdao
He believes that "a fortunate author can write maybe 12 novels in his lifetime."
他认为“幸运的作家一生可以写12部小说。”
A lifetime of effort, maybe not as beautiful as a minute or two imaginary lies.
一辈子的努力，也许没有一两分钟想象出来的谎言来得美丽。
"And here I'm just talking about it in about 15 or 20 seconds, maybe a minute, but it was a lifetime."
VOA: standard.2009.06.02
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